Hand-stoker.



G. H. THACHER, JR.

HAND STOKEB.

APPLICATJON FILED SEPT. 15. \QIT Patented Apr. 29, 1919.

3 SHEETSSHEETI G. H. THACHER, 1n. HAND STOKEH.

7 APPLICATION FILED SEPT-15.19M-

1,302,453., Patented Apr. 29,1919.

3 SHEETS-SHEET 2.

G. H. THACHER, JR.

HAND STOKER.

APPLlCATJON FILED SEPT. 15. NH.

Patented Apr. 29, 1919.

3 SHEETS-SHEET 3.

Urrnn GEORGE HOWELL TEACHER, JR. OF ALBAHJT, NEW 'lTGRK, ASSIGNUR 1ND 19116 ENGINEERING COMPANY, INC., A CORPDRtTEIUIN' or Ell-101) lfiibhl llllu HAND-STOKER.

mum

Specification of Letters .Patent.

Patented Ann 3359 Application filed September 15, 1917; Serial rm M11572 and I do hereby declare the following to he a full. clear, and exact description of the inventioin Such as will enable others ralrilled in the art to which 'it appertaine to make and use the same.

The present invention relates; to improve meals in hand stokere of the general t he in which combustion takes place upon an inelined grate made, up of a plurality o'i transverse grate or stoker bars, with a eleaning or dumping grate bar at the lower end of the incline. In etokers of this general type the StOlCGl' bars and the cleaning grate are mounted to rock on. inclined supporting bars extending from the front of the furnace to the bridge wall. The Stoker bars are usually arranged to form two series of connected bars by attaching alternate bars throughout the length of the grate to actuating: mechanism by means of which each series of bars may be rocked independently of the other series to advance the fuel. toward the cleanin grate and at the same time silt fine ashes through the stolrer bars. Inorder to prevent fuel falling between the stoker bars as well as to eliiniiiate trouble with elinlrers locking the bars when they a re oscillated, the bars may be formed on the side toward the upper end of the inolinecl grate, with curved shields which swing" above. the plane of the grate when the bars are roeked.

The present invention involves improvemerits in Stoker bars and 'eleaniiug; grates parattached to the end portions; of the bar.

tieularly adapted for use in hand operated Stoker's of the type deserihltal ahove. in accordance with the present inveiztion the Stoker bars are made up of integral shield and'end portioneand reinovahle grate faces which when in place are supported at one edge by the shield portion'of the bar and at the other edge by a rod which at. its ends in The shield portion is formed with apertures through which air may he, admitted to the fuel while the SlIGlCQI bar is being inanipulated. The bearing members; and the lugs by which each liar is eonneeted to the anti ating mechanism are -formed integral with the end portions of the bar.

' gratin a lon .i he entire eon struetion comprises but few partiawhich may be quickly and easily assembled, or re moved for the ynn'pooe of repair or lnent hy new ones. cleaning grate. is also of improved shape an eonstrui" particularly adapted for use in eonbn i. with the atelier bar of "the present invert Tl ie lion.

The partieular nature of vention will appear moot elezv arriplion o? a preferzezl c as illustrated in the. aeeox in whielu Figure l is; a furnace .--.iiou'iu the e: ration; Fig. '2 is a tranin'erse aeration th n-ugh. the stoke) along the line of Fig; l 3 i a longitudinal section through the cleaning grate and two of the arljacei'it Po bars. l i ie a section through the c g the line lt of Fig 3, 5 a detailed View oi a part of the shield and one end of a striker oar; F (1 a detailed View of a, portion of the g, :e men'iher of a toker bar; Fig. 7 in a detailed "view of the rod for supporting" the te and Fig 8 15a detailed view of a portion of a cleaning grate Illeferrin to the drawings in which ;I hit" reference eharaetere denote similar throiwhout the several views 10 ind" the firont Wall of the furnace and ll bridge, wall tl'lereolf. 1:3 is a ca fire door of the iront t ail and it ith a shoulder for supporting; the miner ends oi im'lined bearing hare 13 of winch there are three. shown in the furnaoe iliuetrated he sin. lli eh bearing bar is: provided at its lower end with. a -toe portion 14i- Whieh on a Supporting ledge in the hriuge wall As; Shown i'nosli elearly in Fig. 2 two Oi the hearing; bars are uljaoenr the aide Willi}; o" the furnace while the third bar is oawav midway betweei'i the other two. 'lihe coirstruetion thus provides for two inelii d grate unite. each of \vhieh is ii'ide'peadent in We? all respects from the other it will be understood that by the prowl ion of additional hearing bars, the grate Surface of the fun once may he made up of as nearly ni'iii'te a deei red.

Each unit eon'iprises uun'iher of atelier bars 15 aiding transversely of the grate and a cleaning" rate '16 at the. lower end off the inelii'ied grate. The construction of the elemento of the rate har a onears most EM? rot/ion throw in int 4 clearly from Figs. 5, 6 and 7. Each bar comprises end portions 17 and ashield 18 lying between and preferably formed integrally with the end portions. The shield is provided with a number of air apertures 19, and a row of recesses 20 near its upper edge. Each end portion 17 is provided with an integral hub 21 adapted to fit in correspondingly shaped recesses in the bearing bars. -One end portion of each stoker bar has integral extensions forming a pair of lugs 22 which serve as a means for attaching the stoker bar to the actuating mechanism. Each end portion 17 is also provided with a wedge shaped recess 23 and a bolt hole 24:. A supporting rod 25 is formed at its ends with wedge shaped extensions 26 adapted to fit within the recesses 23 and provided with bolt holes 27 adapted to registcr with the bolt holes 21- to receive pins or bolts for holding the supporting rod in place. The grate 28 of each sicker bar is formed of transverse and longitudinal members the latter being extended as at 29 to form lugs adapted to fit within the recesses 20 in the shield of the stoker bar. The other end 30 of each longitudinal member is extended beyond the corresponding tansverse member, and preferably curved, thus forming a lower serrated edge which tends to break up the clinkers they pass between the grates during the cleaning operation. The under face of each longitudinal member is provided near its lower end with a tapering recess 31 adapted to fit over the supporting rod 25, the sides of which should be formed with a corresponding taper.

A portion of a cleaning grate 1G is shown in enlarged view in Fig. 8. It comprises a fiat portion provided with the usual longi tudinal slots. The grate also has a portion 36 curved upwardly above the plane oi the flat portion and this curved portion is pro vided with a number of airapertures 37. Extending downwardly from the upper edge of the curved portion 36 is a curved. shield portion 38 and these two portions are connected together at the ends of thegrate by integral end portions 39, one of which may be extended as at 40 to provide a pair of lugs to which the actuating mechanism may be attached. Hubs 41 for supporting the cleaning grate upon the bearing bars extend outwardly from each end of the grate approximately in line with the point where the flat portion 35 and the curved portion 36 join each other. Along the upper edge of the grate where the curved portion 36 and the shield portion 38 join is a rib or extension 42 adapted to engage the serrated lower edge 05? the adjacent stoker bar to prevent fuel or ashes from falling between the serrations or into the space that would otherwise he loft at the upper edge of the cleaning grate.

of one series of connected bars is formed with its lugs 22 on the end portions toward one side of the unit, while each stoker bar of the other series of connected bars is formed with its lug 22 on the end portion toward the opposite side of the unit, so that as shown most clearly in Fig. 2 the actuatin'g bars -15 ot' one series of stoker bars he on one side of the unit while the corresponding actuating bar for the other series of stokcr bars lies on the opposite side of the unit. Thus there is no interference between the actuating bars of each. series. Each actuating bar is connected to a rod -16 extending through an aperture in the front wall of the "furnace and connected to a lever 47 mounted upon a bracket 48. Each lever is provided with a socket t!) into which may be inserted a hand bar for operating the grate bars. The cleaning grate is rocked by means of a rod 50 connected to the lugs 10 and extending outwardly to the trout of the furnace where it may be manipulated by any convenient mechanism. The cleaning grate is so disposed upon the bearings bars '1?) that its curved shield portion 38 lies closely adjacent the serrated edge of the lowermost Stoker bar so that when the cleaning grate is rocked, there will be no loss of fuel between it and the adjacent stoker bar, but on account oi? the serrated construction of the lower edge of this stolccr har, ashes lying above the saline may be discharged when the rib 42 is lifted to uncover this edg'e.

In the operation of the stoke!" of the present invention, combustion of the fuel takes place primarily upon the stoker bars, but by virtue of the perforated curved portion 36 ol the cleaning grate, air will be admitted to the fuel as it passes oll ot' the stokc'r bars so that any unconsumed fuel whichreaches the cleaning grate may be burned While passing over the curved portion 36, and combustion may also talce place if any unconsumcd fuel reaches the flat portion of the cleaning grate. When it is necessary to shake the grate to move the fuel bed toward the cleaning grate and remove any ashes that may fall through the stoker bars, either one-or the other series of stoker bars may be rocked by manipu lation of its corresponding lever 47; lVhen any of the bars are rocked into the position shown in Fig. 1, the shields Will prevent fuel from. dropping between these bars and the bars which. have not been moved. This operation will not interfere with the supply of air to the fuel bed since the latter takes place through the apertures 19 in the shields and these apertures should be of sufficient number and extent to permit enough air to pass through the fuel to prevent any appreciable decrease in combustion during the shaking operation.

The two series of connected stoker bars may be operated successively or even simul taneously, if desired. In the latter event, the shield portions of the bars will prevent fuel from falling between the bars even if all of the bars of the grate be tipped. The cleaning grate may be manipulated as desired and whenever it is rocked the shield portion thereof will prevent loss of fuel be- .tween this grateand the adjacent Stoker bar. By making, eaehstoker bar of the construction described. the grate surface thereof may be removed without taking; the whole bar out of the furnace. The grate surface may be easily and quickly detached from the stokcr bar by simply removing the retaining bolts to permit the supporting rod 25 to be drawn out of the recesses '23 and the hi 29 of the grate to be drawn out of the recesses 20 in the shield. After this has been done the grate may he lifted oil of the supporting rod. The whole construction is the utmost simplicity, and the component parts of each stokcr bar may be assembled without the use of any other pins or bolts save the two which are used for holding the supporting rod in place. By making the stoker bar of separate elements, the casting, of the same is simplified and hence the cost of production is lessened.

So faas the l'Il'l1)l'0VG(l form of cleaning grate is concerned. it possesses many features of advantage among which may be mentioned the curved portion provided with air apertures over which the fuel passes before reaching the fiat'surfaee of the grate and which tends to promote completoconr bustion of the fuel. The solid shield tion prevents any fuel l romi'allingz between this grate and the adjacent Stoker bar when llw grain is rocked. The 'weight of the cleaning: grate is so distributed upon either side of its bearing hubs that it may be easily rocked even when there is a considerable amount of ash upon its surface.

While the stoker lJEll'S and cleaning grates of the present invention have been shown (unbodied in a particular type of furnace, it will be understood that they are equally applirablc to furnaces of other types, and also that various changes may be made in the details of construction of all of the members without, departing from the principle of the invention.

I claim:

1. A hand stoker having inclined bearing bars and a plurality of stoker bars mounted to rock on the bearing bars, each of said stoker bars being provided with a. removable grate and a' curved shield on the side of the bar toward the upper end of the stoker, the shield being adapted swing above the upper face of the stoker when the bar is tipped and being provided with apertures through which air may be supplied to the fuel bed when the stoker bar is in tipped position.

2. A hand stokcr having inclined bearing bars and a plurality of Stoker bars mounted to rock on the bearing bars, each of said stoker bars being provided with a Hat removable grate and a curved shield on the side oi the bar toward the upper end. of the Stoker. the shield being adapted to swing above the upper face of the stoker when the bar is tipped and being provided with apertures through which air may be supplied to the fuel bcd'whcn the stoker bar is in tipped position.

A hand stoker having inclined bearing bars and a pin alit v o'l stoker bars mounted to rock on the bearinp bars, each of said stoker bars being provided with a flat removable grate a nd a curved shield on the side of the bar toward the upper end of the Stoker, the shield being adapted to swing; above the upper face of the stoker when the bar is tipped and being provided with aperturesthrough which air may be supplled to the fuel bed when the stoker bar is in tipped position and a rocking cleaning grate mount ed at the lower ends of the bearing; bars.

el. A. hand. stoker having inclined bearing bars and a iilurality of Stoker bars mounted to rock on the bearing.ba1's,'eacl1 of said stoker bars being provided with a flat removable grate and a curved shield on the side or the bar toward the upper end of the Stoker, the shield. being adapted to swing above the upper face of thestoker when the bar is tipped and being pro'idded with apertures through which air may be supplied to the fuel bed when the stoker bar is in tipped position and. a rocking cleaning grate mounted at the lower ends of the bearing bars, said cleaning {Irate being provided with a curved shield adjacent the lowermost stoker bar to prevent loss of fuel when the cleaning grate is tipped.

5. A. hand stoker having inclined bearing bars and a plurality of stoker bars mounted to rock on the bearing bars, each of said stoker bars being provided with a removable grate and av curved shield on the side of the bar toward the upper end. of the stoker, the shield being adapted to swing adjacent the lowermost stoke-r bar to prevent loss of fuel when the cleaning grate is tipped.

6. In stoking bars for furnaces, the combi- 5 nation of integral shield and end portions,

a removable grate and means whereby the grate may be supported upon the end and shield portions.

7. In -stoking bars for furnaces, the combination of a curved shield portion provided th air apertures and recesses and end por- 't i(' ns integral with the shield portion, a sup porting rod det-achably mounted upon the end portions and a grate supported upon the rod and having lugs adapted to enter the recesses in the shieldv 8. In stoking bars for furnaces, the combination of a curved shield portion provided with air apertures and recesses, end portions integral with the shield portion and provided with bearing hubs and downwardly extending lugs, a removable grate and means whereby the grate may be supported upon the end and shield portions.

9. In stoking bars for furnaces, the combination of a curved shield portion provided with air apertures and recesses, end portions integral with the shield portions and having wedge-shaped recesses on their inner faces,

a supporting rod provided with wedge shaped extensions adapted to fit the said recesses, means passing through the extensions and the said end portions to hold the rod in place and a grate supported upon the rod and having lugs adapted to enter the recesses in the shield portion.

10. In stoking bars for furnaces, the combination of a curved shield portion provided with air apertures and recesses, end por- 4 tions integral with the shield portion and provided with bearing members and downi'ardly extendinglugs and'being formed with wedge-shaped recesses on their inner faces, a supporting rod provided at its ends 3 with wedge-shaped extensions adapted to enter the said recesses, means passing through the said extensions and the said end portions for holding the rod in place, and a flat grate having lugs adapted to enter the 5 recesses in the shield portion and having re cesses adapted to fit over the top of the supporting rod.

11. In combination, a cleaning grate for furnaces comprising a flat slotted grate, an

integral curved portion extending above the fiat surface and provided with air apertures,

a curved shield extending downwardly from theupper edge of the curved portion and a rib extending along the meeting edge of the shield and the curved portion, and a stolzer E bar ha ving a movable serrated eds,- adjacei'it to said curved shield; substantially as described.

12 A hand Stoker having inclined hearing bars, a plurality oi? stolrer bars mounted e. to rock on the bearing bars, and each proi vided with a. serrated lower edge, and a cleaning grate. mounted to rock on the lower ends of the bearing bars, said cleaning grate being provided with a flat portion having Ii apertures therein, a portion forming an integral upwardly curved or cnsion oi fl flat portion, a curved shield portion in with and extending; dmvnwardly lira upper edge of the curved extension and members proj tit from the sides o grate a? wuhstantiaily the intersection o flat portion and the curven extension, pivot 'men'ibers being so placed on said hearing bars that the curved shield. portion lies closely a liacent the serrated ed of the loworin stoker bar in order to prevent loss of filGl when the cleaning; grate is 1'0- tated about said pivots.

13. A hand stolrcr lniving inclined bearv5 ing bars, a pluralltv of stolter i'lzi-l't mounted to rock on the bearing bars, and each pro-- vided with a serrated lower eo.-.

apertures therein, a portion forini tegraL upwardly curved extens I'l'at portion, pivot members pro] 7 h the sides of the grate at subs'ta: .l vi terseetion of the flat p ion and the curved extension and a shield portion integral with and extending dmvnwardly from the *c the curved extension and curved con cailly about said pivot members as a center, m9 said pivot members being so mounted on the bearing" bars that the said shield I lies closely adjacent the serrated edge of the lowermost sto'king bar to loss fuel when the. cleaning grate. rotated o; 3 the pivot members.

In testimony-whereof I. atliii Correction It is hereby cemified that the namevoi' the pateptee in LettersPatnt N o.

1,302,4t53, Wanted April 29, 1919, for 2w improvement in Hand-Stokers, was

erroneously written and printed George Howell Thacher, J12]? whereas; said name should have been written and printed as George HomeZZ Thacher, J12; and

the said Letters Patent should read. With this correct-ion therein that the same may oonform to the record of the; case in the Patent OfiigeI Signed and. seaied this 212d day 0% July, A. D; 1919.

gm/$14. 1%. 1 WHITEHEAD,

Acting Uommissz'omr of Patents. 

